(theology) The Roman Catholic, Arminian and Socinian doctrine that the human will cooperates with the divine in the matter of saving grace.

A form of federalism in which national, state, and local governments interact cooperatively and collectively to solve common problems, rather than making separate but similar policies.

(aviation) A mechanical aerodynamic wedge that prevents the ventral airstair of an aircraft from being lowered during flight.

plural of Cooper vane

plural of Cooper test

(sociolinguistics) The idea that listeners and speakers need to cooperate in order to communicate effectively.

A river in Australia, flowing into Lake Eyre basin.

Accipiter cooperii, a medium-sized hawk found from Canada to northern Mexico.

plural of Cooper pair

plural of Cooper's hawk